PURPOSE: To perform the detection of a substance inducing a small animal or evaded by said animal, by allowing the component separated from a sample to act on plural kinds of small animals.

CONSTITUTION: A different kind of small animals are received in feeding boxes 5b... and a sample is injected in a specimen injection port 2. This sample is separated into components by a column 1 and discharged to a detector 4 and the feeding boxes 5b... as different components from the column 1 with the elapse of time. By this mechanism, small animals are doused with various substances and, when the doused components are induction substances or evasion substances to small animals, said animals excite and jump about. The motions of the small animals are detected by vibration detectors 5a... and the motion amounts of the small animals are recorded by recorders 8.... By this method, experiment is repeated by replacing a sample and the substance inducing a small animal or evaded thereby can be specified.